| /* GObject - GLib Type, Object, Parameter and Signal Library |
| * Copyright (C) 2009 Benjamin Otte <otte@gnome.org> |
| * |
| * SPDX-License-Identifier: LGPL-2.1-or-later |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General |
| * Public License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| #ifndef __G_ATOMIC_ARRAY_H__ |
| #define __G_ATOMIC_ARRAY_H__ |
| |
| #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION) |
| #error "Only <glib-object.h> can be included directly." |
| #endif |
| |
| #include <glib/glib.h> |
| |
| G_BEGIN_DECLS |
| |
| typedef union _GAtomicArrayMetadata |
| { |
| gsize size; |
| /* We have to ensure that the memory location is sufficiently aligned to |
| * store any object. With C11 this would be max_align_t, but in practise |
| * gpointer is sufficient for all known architectures. We could change |
| * this to `_Alignas(max_align_t) char pad` once we depend on C11. */ |
| gpointer _alignment_padding; |
| } GAtomicArrayMetadata; |
| #define G_ATOMIC_ARRAY_DATA_SIZE(mem) (((GAtomicArrayMetadata *) (mem) - 1)->size) |
| |
| typedef struct _GAtomicArray GAtomicArray; |
| struct _GAtomicArray { |
| gpointer data; /* elements - atomic */ |
| }; |
| |
| void _g_atomic_array_init (GAtomicArray *array); |
| gpointer _g_atomic_array_copy (GAtomicArray *array, |
| gsize header_size, |
| gsize additional_element_size); |
| void _g_atomic_array_update (GAtomicArray *array, |
| gpointer new_data); |
| |
| #define G_ATOMIC_ARRAY_GET_LOCKED(_array, _type) ((_type *)((_array)->data)) |
| |
| #define G_ATOMIC_ARRAY_DO_TRANSACTION(_array, _type, _C_) G_STMT_START { \ |
| gpointer *_datap = &(_array)->data; \ |
| _type *transaction_data, *__check; \ |
| \ |
| __check = g_atomic_pointer_get (_datap); \ |
| do { \ |
| transaction_data = __check; \ |
| {_C_;} \ |
| __check = g_atomic_pointer_get (_datap); \ |
| } while (transaction_data != __check); \ |
| } G_STMT_END |
| |
| G_END_DECLS |
| |
| #endif /* __G_ATOMIC_ARRAY_H__ */ |